If you have the microphone activated, the audio quality of your Jabra device will be piss poor. Corded is fine.
It helps to deactivate/activate the headset-microphone. Maybe you just have to do it once or allways… Jabra says this is by design (half the bandwith when using the microphone).
Thread on Reddit
Technik-Probleme die ich irgendwie behoben habe.